Your and her life is different.
What you like is what she don't like.
What she like is what you don't like.
It's better this had end this way.
It's the nature.
I think you have higher dreams. So let these dreams to fly. Free those dreams.
What you need is to learn more and a big company to work isn't it ?
Isn't it machan ?
Trust me, your undergraduate level girl friend is not suitable as your post graduate girlfriend. She is a family and he hermones were changed. That's why she thinks differently. But you still wants to study, but she want to be a family. See the difference. She don't need to hurt you at all. But it's the nature.
So forget her and let your dreams and desires to fly away seeking the freedom.
You feel unconfortable because you still thinks about her and cares about her. Stop that. Instead think about you.
You are a being with pain receptors too. So understand yourself first.